underwriting and offer workspaces · Intermediate
Amortization and interest-only schedule
Calculate payments balances and balloon through an interest-only transition. Includes exportable dated principal and interest schedule.
Your assumptions
Illustrative starting values. Replace them with your own evidence. Inputs stay in this browser.
Your scenario, explained
Results
Calculation assumptions
Version 1.0.0 · Educational scenario, subject to the stated assumptions.
How this calculation works
Method and assumptions
Monthly interest uses annual nominal rate ÷ 12. The selected IO convention determines the amortizing payment. Remaining principal is shown separately as a balloon after the final regular payment.
Worked example
For $1 million at 6%, a 120-month maturity and 24 initial interest-only months, the first payment is $5,000. Starting a full 30-year amortization after IO raises the payment to $5,995.51. After the 120th regular payment, the balloon is $877,723.54. Total interest over the term is $573,292.05; the balloon is additional principal due.
Before using the result
Know the boundaries
- Educational scenario, not a quote, commitment, approval, appraisal or payoff statement.
- Defaults and thresholds are editable illustrations; the executed documents and lender underwriting control.
- Uses equal monthly periods, not actual-day accrual. No escrow, fees or unscheduled payments are modeled.
Method references
Discuss your financing with Jaken Finance Group ↗Keep working through the decision
Related resources
Interest-only underwriting and the amortizing refinance test
Evaluate an interest-only loan against the next loan's payment burden. Includes current-payment versus exit-payment sizing schedule.
Payment changes after an interest-only period
Compare fresh and remaining amortization periods, payment shock and cash-flow headroom when an interest-only period ends.
Separate debt balances, commitments and maturity obligations in one schedule
Editable facility-level debt schedule tracks funded principal, undrawn commitments, maturity balances, payoff additions and extension conditions without duplicating collateral debt.